4.2 Electron Transport Chain

Question 1

what is the function of the chain?

Answer 1

to extract the potential energy in NADH and FADH2 and make it available to the synthesis of additional ATP

Question 2

chemiosmosis

Answer 2

the process in which ATP is synthesized using the energy of an electrochemical gradient and the ATP synthase enzyme

Question 3

proton-motive force

Answer 3

moves protons bc of a chemical gradient of protons across a membrane

Question 4

proton gradient

Answer 4

a difference of proton concentration across a membrane

Question 5

where does it occur?

Answer 5

inner mitochondrial matrix

Question 6

What 3 protein pumps are embedded in the membrane from low to high EN?

Answer 6

NADH dehydrogenase (complex 1)
cytochrome b-c (complex 3)
cytochrome oxidase complex (complex 4)

Question 7

1 peripheral membrane protein

Answer 7

succinate dehydrogenase (complex 2)

Question 8

Describe the process

Answer 8

1. e- travel downhill through protein via ubiquinone and cytochrome c, releasing free energy
2. free energy is used to move H+ from matrix to the intermembrane space through protein pumps
3. oxygen accepts e- and H+ and water is formed at the end of the chain (complex 4)

Question 9

why do e- travel downhill?

Answer 9

because of greater EN, oxygen, and H=+ make it stable